CoolScan support has improved a lot in the last month or so. I don't have one so I cant comment in practice, but its a very active project and I'd definitely encourage you to submit bugs if you have a coolscan.
Ooh great I'll check it out. I have a couple of them actually, although I couldn't seem to get one working through the complex series of adapters I had, so I'm gonna set up a new machine with an actual FireWire card and reassess it then. I do at least have one that works in VueScan so I can at least provide some feedback (it's a modded 4000 ED that does whole rolls).